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Nondestructive evaluation of the initial surface damage of structural elements by using nonlinear surface wave

Research Project

Project/Area Number 10450047
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionNagoya Institute of Technology

Principal Investigator

KAWASHIMA Koichiro  Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (50023239)

Co-Investigator(Kenkyū-buntansha) HAYASHI Takahiro  Nagoya Institute of Technology, Faculty of Engineering, Research associate, 工学部, 助手 (30324479)
ITO Toshihiro  Nagoya Institute of Technology, Faculty of Engineering, Associated Professor, 工学部, 助教授 (20203151)
藤井 郁也  名古屋工業大学, 工学部, 助手 (90283481)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1998: ¥8,900,000 (Direct Cost: ¥8,900,000)
KeywordsUltrasonic / Nonlinear wave / Surface wave / Harmonics / Surface crack / Finite element method / Wave propagation / Semi-closed crack / 非破壊材料特性評価 / 欠陥 / 表面微視き裂 / 位相速度分散 / 波動伝播 / 微視き裂 / 数値シミュレーション / 損傷 / 非線形波動 / レーザー超音波 / 材料損傷 / 材料劣化 / 不完全接触面
Research Abstract

The purpose of this project is to establish an ultrasonic evaluation method of nearly closed shallow surface cracks with nonlinear surface wave. The project is composed of (a) the detection of the second harmonic of the leaky Rayleigh wave exited at nearly closed cracks with a line-focused surface wave sensor, and (b) numerical simulation of the nonlinear surface wave propagation by using FEM analysis in which contact elements are introduced to model nearly closed surface cracks.
Main results obtained by this project are summarized in the followings.
1) A nearly closed fatigue crack is detected by the second harmonic amplitude of the leaky Rayleigh wave of 5MHz. A line-focused PVDF sensor was used to transmit 5MHz incident wave to receive the second harmonic wave of 10MHz. The amplitude spectrum of the received waveforms identifies the second harmonic amplitude, by which the second harmonic amplitude ratio, 10MHz amplitude/5MHz amplitude, is evaluated.
2) By applying weak compressive stress to close the fatigue cracks, the second harmonic amplitude ratio shows marked change. Thus, fatigue cracks are identified.
3) FEM analyzes combined with contacts element to model nearly closed cracks simulate generation and propagation of the second harmonic wave excited at the cracks by the Rayleigh wave.
4) The second harmonic amplitude ratio of an inclined surface cracks is far smaller than that ofa perpendicular crack.
5) The second harmonic amplitude ratio is proportional to the crack depth up to a quarter of the surface wavelength, but it is saturated for deeper cracks over that depth.

Report

(4 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] K.Kawashima, R.Omote, T.Ito, H.Fujita, T.Shima: "Nonlinear acoustic response through minute surface cracks : FEM simulation and experiment"Ultrasonics. 40/2(In press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Omote, K.Kawshima, T.Ito: "Simulation of nonlinear Rayleigh wave propagation through minute surface cracks"Proc. 2001 IEEE Ultrasonic Symposium. (In press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Okada, T.Ito, K Kawashima, N.Nishimura: "Finite element simulation of nonlinear acoustic behavior at minute cracks using singular element"Jpn. J. AppL Phys.. 40. 3579-3582 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 表, 川嶋, 伊藤: "表面斜め表面き裂を通過するレイリー波ノ非線形性"第9回超音波による非破壊評価シンポジウム. 61-62 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 島, 藤田, 下野, 川嶋: "非線形超音波を用いたコーティング膜模擬剥離検出"日本非破壊検査協会平成13年度春季大会講演会. 13-14 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Kawashima, R. Omote, T. Ito, H. Fujita, T. Shima: "Nonlinear acoustic response through minute surface cracks: FEM simulation and experiment"Ultrasonics. 40-2, (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Omote, K. Kawshima, T. Ito: "Simulation of nonlinear Rayleigh wave propagation through minute surface cracks"Proc. 2001 IEEE Ultrasonic Symposium. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Okada, T. Ito, K. Kawashima, N. Nishimura: "Finite element simulation of nonlinear acoustic behavior at minute cracks using singular element"Jpn. J. Appl. Phys.. 40-2. 3579-3582 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Omote, K Kawashima, T. Ito: "Nonlinearity of Rayleigh wave past through inclined surface nearly closed crack(in Japanese)"Proc. 9th Symposium on Ultrasonic Testing Japanese Society for Nondestructive Inspection. 61-62. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Kawashima, T. Omote, T. Ito: "Evaluation of semi-closed surface cracks with nonlinear ultrasonic wave (in Japanese)"Proc. JDNDI Fall Conference 2001 Japanese Society for Nondestructive Inspection. 9-10. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Omote, T. Ito, K. Kawashima: "FEM simulation for detecting higher harmonics excited at semi-closed surface cracks (in Japanese)"Technical reports on ultrasonic testing #21659 Japanese Society for Nondestructive Inspection. 71-74. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Shima, H. Fujita, K. Kawashima: "Surface microcrack detection with nonlinear surface wave (in Japanese)"Proc. 8^<th> Symposium on Ultrasonic Testing Japanese Society for Nondestructive Inspection. 115-116. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Kawashima, K. Nawa: "Detection of the second harmonic of longitudinal wave with large amplitude incident wave (in Japanese)"Proc. 6th Symposium on Ultrasonic Testing Japanese Society for Nondestructive Inspection. 57-58. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 藤田,島,下野,川嶋: "非線形漏洩表面波を用いた表面微小き裂検出"第8回超音波による非破壊評価シンポジウム. 8. 115-116 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 岡田,川嶋,伊藤,西村: "特異要素を用いた有限要素法による微小き裂透過波に現れる2次高調波のシミュレーション"第8回超音波による非破壊評価シンポジウム. 8. 37-42 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Kawashima, et al.: "Evaluation of ensemble of minute cracks generated by spallation with nonlinear ultrasonic measurement"Review of Progress in Quantitative Nondestructive Evaluation. 21(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.Okada,T.Ito,K.Kawashima,N.Nishimura: "Finite element simulation of nonlinear acoustic behavior at minute cracks"Japanese Journal of Applied Physics. 41(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 伊藤,川嶋,森,表: "有限要素法による漏洩表面波伝搬のシミュレーション"日本機械学会論文集A. 65. 589-596 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 川嶋,伊藤,竹之内,表: "Attenuation of leaky Rayleigh wave : Experiment and numerical simulation"Review of Progress in QNDE. 18. 175-181 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 川嶋,名和: "強力超音波による不完全接合面での波形ひずみ検出"第2回 音弾性応用測定研究会. 39-44 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 川嶋,岡田,西村: "高調波振幅を用いた内部微視き裂検出"第7回超音波による非破壊評価シンポジウム. 21-24 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 名和,川嶋,服部: "強力超音波を用いた高調波の検出" 第6回超音波による非破壊評価シンポジウム. 6. 57-58 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 田中,川嶋: "レーザー干渉計を用いた横波探触子の振幅特性" 日本非破壊検査協会平成11年度春季大会講演概要集. (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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